Wilhelm lindemann



No. 623,483. Patented Apr. 18, I899. W. LINDEMANN. TWYER FOB SMITHS HEARTHS 0B FUBGES.

(Application filed Aug. 11, 189 8.)

/ N VE IV T 0R (No Model.)

WITNESSES.

UNTTTJD STATES VVILHELH LINDEMANN, OF RATHENO W, GERMANY.

TWYER FOR SMITHSYH EARTHS OR FORGES.

SPECIFICATION forming part of Letters Patent No. 623,483, dated April 18, 1899.

Application filed August 11, 1898. Serial No. 688,372. (N0 odel-) To ctZZ whom it may concern.-

Be it known that I, WILHELM LINDEMANN, a subject of the King of Prussia, German Emperor, residing at Rathenow, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Twyers-for Smiths Hearths or Forges, of which the following is a specification.

This invention relates to a new or improved twyer for a smiths hearth or forge, and has for its object the attainment of a fire clear of ash and coal-dust and the prevention of these impurities from becoming mixed with the redhot forging on the hearth. This is attained by a special construction of hearth, in which the cinder and impurities are automatically removed. The air-blast is of circular form, issuing from an annular outlet, by which the blast is concentrated toward the middle of the fire, causing it to become hot very quickly and to attain a high temperature, and in consequence of which the removal of all ash and dust is effected through the outfall provided for the purpose by reason of the pressure of the coal above. For the prevention of the rapid wasting away of this hearth through the burning of the parts adjacent to the fire it can be supplied with a water cooling arrangement, and this kind of construction shall be described and explained in what follows as an example of its construction.

In the accompanying drawings, Figure 1 is a longitudinal vertical section through a twyer for a smiths hearth with water cooling arrangement; Fig. 2, a section of the same on the line as 00, Fig. 1; Fig. 3, a longitudinal vertical section of a twyer for a smiths hearth without water cooling arrangement.

The smiths hearth, Figs. 1 and 2, is of circular form, and consists of an upper part A, an under part B, and the head-piece C, which forms, along with the upper part A, the airchamber D. The blast-pipe E leads into the air-chamber D through the upper part A, and the water-pipe F leads to the water-space G. H is a steam-pipe for conducting away waste steam. The head-piece C, which rests loose on the under part B, has on the thin edge of the rim to of the ash-pan c three or more. projections Z), which insure that the head-piece 0 shall be accurately in the center by bearing against the under sides of the annular air-outlet I, which forms the lower edge of the fire-space. In the bottom of the ashpan .0 there is an outfall for ash d, which widens downward and passes through the opening (2 in the under part B. The upper flange L of the under part B fits against the upper part A, and thus forms the bottom of the air-chamber and of the water-space, being made tight-fitting by means of asbestos packing b. In a suitable place in this flange at the bottom of the air-chamber D there is an opening g for cleaning purposes, which can be closed by the plugfand serves to remove any ash, &c., which may collect there.

The putting together of the new twyer for a smiths hearth is performed as follows: The head-piece C,with its conically-widenin g open ing d over the opening in the under part B, which widens out also to form the base of the cone It, so that this head-piece O is carried by the under part B, is inserted into the central opening of the upper part A until the fiange L closes against the upper part A and the projections b butt against the sides of the airoutlet I, which forms the lower edge of the fire-space. When this is done, the screws t are tightened up, whereby all the parts of the hearth are firmly held together.

The method of use is as follows: After the pipe E has been connected to the blast-pipe and the tube F connected to a water-cistern placed at a proper height and the steam-exhaust pipe led out into the open air the fire is lighted and the blast started. The blast passes through the pipe E into the circular air-chamber D, thence through the narrow annular outlet I, and forms in consequence of the manner of construction of the latter and the shape of the lower edge of the firespace an upward-rushing cone of wind, which produces a concentration of the blast in the center of the fire, and in this way the heating takes place very quickly and an unusually high temperature is (Jbtained, while in consequence of the sloping walls of the fire-space and the ash-pan, which is underneath, the removal of the ash, &c., through the outfall d is effected by the unburned coal pressing downward toward it on all sides.

By this new construction of hearth there is obtained a fire free from cinder, ash, and coaldust, which has not hitherto been obtained,

and thereby the mixing of these impurities with the forging completely avoided.

For the prevention of the rapid waste through burning of the parts exposed to the fire these parts are Surrounded by the circular water-chamber G, to which water is conducted by the tube F and from which the steam is conducted away into the open air through the waste-steam pipe.

Having thus particularly described and ascertained the nature of my invention and in what manner the same is to be performed, I claim as new and desire to secure by Letters Patent 1. In a twyer of the character described, the combination with a hearth having an airchambertherein, a concave depression in the upper side of the said hearth, a central opening at the bottom of the said depression, communicating with the said air-chamber, an inwardly projecting flange around the said opening, and means for introducing air to the said air-chamber; of a body fitted within the said air-chamber, the said body having a concave upper side and a central opening through the bottom of the said concave portion extending through the said body, a flange around the upper part of the said body and projections around the said flange adapted to rest against the under side of the inwardly-projecting flange on the hearth, the opposing edges of the two flanges being shaped so as to direct the air toward the center of the fire 1 to form a conical blast, substantially as described.

2. In a twyer of the character described, the combination with a hearth having an aircha-mber therein, and means for introducing air into the said air-chamber, a water-chamber encircling the said air-chamber,and means for introducing water into the said waterchamber, a concave depression in the upper side of the said hearth, a central opening at the bottom. of the said depression, communicatin g with the said air-chamber, an inwardlyprojecting flange around the said opening, of a body fitted within the said air-chamber, the said body having a concave upper side and a central opening through the bottom of the said concave portion extending through the said body, a flange around the upper part of the said body and projections around the said flange adapted to rest against the under side of the inwardlyprojecting flange on the hearth, the opposing edges of the two flanges being shaped so as to direct the air toward the center of the fire to form a conical blast, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in pres ence of two subscribing witnesses.

VILUE L LINDEMANN.

\Vi tn esses:

FRANZ SCHULTZE, GARL ALBRECHT. 

